Giving brainliest!! if you answer correctly :) (30pts)

What are chlorofluorocarbons and what impact do they have on the atmosphere?

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?